I'd like to replace 55 year old wooden windows with new vinyl replacement windows.

My question concerns measuring properly before selecting the correct replacement window size. I have measured the jamb in (3) locations...top, middle, and bottom. Each of these measurements are 28 5/8". I've also measured from the header to the front of the stool in (3) locations...left, center, and right. The smallest of these measurements is 53 13/16".

Now, I realize that the replacement window rests against the rear stops & it's here that I'd have a concern. After measuring the distance between the rear stops ( 27 3/4" )...I am wondering if the replacement vinyl window will sit properly against the rear stops. The new vinyl replacement window actual height & actual width measurements are 53 3/4" X 27 3/4"...with rough opening measurements being 28" X 54".

Will this window fit, or will the rear stops need to be replaced. Oh, I also measured the width of the rear stops...one measures 5/8" & the other 7/16".

Not sure if you are referring to interior or exterior stops when you say "rear". The height should be okay (although tighter than I would like). On width, it will be a matter of whether the interior stops provide sufficient coverage for the edge of the window. Based on your measurements, it probably won't, especially if the window has an accessory groove. It is possible that the gap will be small enough to caulk, if not, you will have to explore other options: vinyl frame expander, wider stops, stacking stops, etc.

Yes, I am referring to the stops that the replacement window sits against. I'd be removing the stops that hold in the front sash, then the parting bead that holds in the rear sash, and finally exposing the stops that the replacement window rests upon.

Do I assume correctly that because the window is 27 3/4 inches wide and the distance between the stops is 27 3/4"...that wider stops would have to be installed?

PARebel wrote:Yes, I am referring to the stops that the replacement window sits against. I'd be removing the stops that hold in the front sash, then the parting bead that holds in the rear sash, and finally exposing the stops that the replacement window rests upon.

Do I assume correctly that because the window is 27 3/4 inches wide and the distance between the stops is 27 3/4"...that wider stops would have to be installed?

Thanks

All are different.

Usually, in the case of a 27.75" replacement window, the net area behind the stops will be 28" and allow for shimming and spray foam.